\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3.5/0/C, 2.2/2/A}
    \tkzDefPointOnLine[pos=0.2](A,B)  \tkzGetPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(C,D)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](B)
    \tkzLabelPoints[above, xshift=-0.3em](D)
    \tkzLabelPoints[right](C)
\end{tikzpicture}

